The Big Setup 11-2 (aka. Construction of the Tower Bridge) is the second level of the third theme of The Big Setup.
Launch the first Big Brother into the bottom-left of the first tower. Fire the next one head-on into the middle tower, pushing it to the right. With a little luck, the ice planks in the middle will give way and pop the small pig in the trough. If not, loft the last bird to pop that small pig.